Dust collector for use in overhead drilling



Feb. l5, 1955 F. G. BROWN ET AL DUST COLLECTOR FOR USE IN OVERHEADDRILLING Filed May 8, 1952 INVENTORS DUST CLLECTOR FR USE IN OVERHEADDRILLING Forrest G. Brown, Pound, Va., and Benjamin F. Gish, Seco, Ky.

Application May 8, 1952, Serial No. 286,850

1 Claim. (Cl. Z55-50) This invention relates to a dust collector for usein overhead drilling.

The invention is more particularly concerned with a device forcollecting or trapping dust in drilling holes in the roof of a coal minewhich dust is not only annoying but is injurious to the health ofoperators.

A primary object of the invention is to provide a drill traversing dustcollector in the form of a vertically elongated and collapsible baghaving one end thereof for dust scaling engagement with a roof orceiling in which a vertical hole is being drilled.

A further object of the invention is to provide a device of the abovenoted character which is relatively simple in construction and which iscapable of being expeditiously positioned for use and which is furthercapable of ready discharge of collected dust therefrom.

Other objects and advantages of the invention will become apparent inthe course of the following detailed description, taken in connectionwith the accompanying drawing wherein- Fig. l is a vertical axialsection of the improved dust collector in accordance with a preferredstructural embodiment thereof.

Fig. 2 is a top plan view of the top plate with the rubber seal ringsupported thereon.

Fig. 3 is a transverse sectional view in the plane of line 3-3 on Fig.1.

Fig. 4 is an elevational view of the bag in partially collapsedcondition.

Referring now in detail to the drawing, the improved dust collector isillustrated in Figs. l and 4 as being operatively associated with adrill including a nose N from which projects an elongated shank S havingon the free end thereof a bit B for drilling a vertical hole H in theroof R of a coal mine.

It is however, to be understood that the dust collector is equallyapplicable for use with drills for providing vertical holes in roofs orceilings other than in coal mines.

The improved dust collector is designated as a whole by the referencecharacter and which includes an elongated open ended canvas bag 11, atop plate 12, a roof engageable rubber sealing ring 13, a bottom plate14, a rubber sealing washer and a coil spring 16.

The upper edge of the bag 11 is secured to the periphery of the topplate 12 by any suitable means as is indicated at 17 in Fig. 2 and thelower edge thereof is secured to the bottom plate 14 by any suitablemeans as is indicated at 18 in Fig. 2.

The sealing ring 13 which is preferably semi-cylindrical in crosssection is suitably secured to the top plate 12 and preferably with thei'lat side thereof engaged with the plate as shown in Fig. l.

Likewise the rubber sealing washer 15 is secured to the inner face ofthe bottom plate 14 as by means of rivets or the like 19 as indicated inFig. 3.

The top plate 12 is of skeleton form providing a central drill shankreceiving opening 20 and a plurality of relatively large dust admittingopenings 21.

The lower plate 14 is adapted to seat on the drill nose N and isprovided with a drill shank receiving opening 22.

The rubber dust sealing washer 15 is provided with a center hole 23 ofless diameter than hole 22 whereby the edge of hole 23 has a frictionalwiping engagement with atent the drill shank S to prevent escape of dustthrough the drill shank receiving hole 22. The coil spring 16 isdisposed within the bag with its opposite ends bearing against the topand bottom plates 12 and 14 and the spring normally retains the bag in adistended position as shown in Fig. 1.

In the use of the improved dust collector, the drill shank S is passedthrough openings 22 and 23 in plate 14 and washer 15 respectively,through the bag, and then through opening 20 in the top plate 12.

The drill bit B then upon operation of the drill provides a verticalhole H in the roof R.

In the drilling operation the bit B advances vertically upwardly intothe roof R and dust formed in the drilling operation drops through theopenings 21 in the top plate and into the bag 11.

The sealing ring 13 engages the roof R and prevents escape of dust andthe ring further spaces the top plate from the roof to permit the dustto enter the openings 21.

As the drilling progresses, the distance between the drill neck N andthe roof R becomes gradually less whereby the spring 16 is compressedand the bag 11 collapses, providing edge folds 11 as indicated in Fig. 2and the neck N may approach the roof R to a point wherein the springi 16is fully compressed and the bag wholly collapse When the drillingoperation is completed, the spring land bag will expand with retractionof the drill after which the collected dust may readily be dischargedthrough the openings 21 in the top plate 12.

The top and bottom plates 12 and 14 respectively having the drill shankreceiving openings 20 and 22 respectively provide for support of the bagon the drill shank S in concentric relation thereto, the sealing ring 13provides a dustproof connection between the upper end of the bag and theroof R when the bag is in operative position and the openings 21 providefor passage of dust into the bag.

The rubber sealing ring 15 provides for retention of the collected dustin the bag while in its operative position of Fig. l since the ringmaterial surrounding the opening 23 has a tight wiping action on thedrill shank S.

While we have disclosed our invention in accordance with a singlestructural embodiment thereof, such is to be considered as illustrativeonly and not restrictive, the scope of the invention being dened in thesubjoined claim.

What we claim and desire to secure by U. S. Letters Patent is:

A dust collector comprising an elongated drill shank traversable openended bag, top and bottom ilat circular plates having their peripheriesdisposed within and secured to the top and bottom end edges of the bag,a coil spring disposed within the bag and having its opposite endsengaged with said plates for normally distending the bag, said plateshaving axially aligned drill shank receiving openings centrally thereof,the top plate comprising a hub portion in which the respective drillshank receiving opening is disposed, a relatively narrow rim portion,and spoke-like portions interconnecting the hub and rim portionsproviding relatively large dust admitting openings, a roof engageabledust sealing ring supported on the outer face of said rim portion andsecured thereto, and a flat drill shank engageable washer supported onthe inner face of the bottom plate and provided with a drill shankreceiving opening normally of less diameter than the opening in said topplate, whereby the portion of said Washer surrounding the openingtherein has a frictional-wiping engagement with said shank forprecluding escape of collected dust from the bag when in its verticaloperative position.

References Cited in the file of this patent UNITED STATES PATENTS

